Out lying counties could be a good place for someone to start..One company up here in Oregon built their business in staying out of the major metro counties and concentrating on the rural counties.

We can also see the "concentration" of rental properties per zip code (vs. all residences), which when combined with an "A, B, C, D Neighborhood" classification system (see this blog post for a simple explanation) can paint a pretty specific picture about what micro-markets might work for a given niche & strategy.

Bosko Mijatovic Depends if the agent concentrates on buyers vs listings.Agents shouldn’t be spending excess time on admin work.

@Sean RayStay in your market but concentrate on the suburbs.  

I am concentrated to make my future investments there.

For now, I'd like to concentrate on purchasing 1 or 2 multifamily properties to get started.  

@Dan CawleyGreat questions Dan...IMHO when beginning you should concentrate on a single group.

If you're not interested in marketing you can just concentrate on doing Real Estate.

just because there is a significant investor concentration, doesn't mean there is no financing for those properties; it's just more expensive and requires about 30% down. 

Concentrating on my 9-5 job, I made enough money to begin investing in SFH's in the Florida market and low and behold a few short years later I have 6 rental properties that cash flow nicely!